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We report on the Gilbert damping parameter $\alpha$, the effectivemagnetization $4\pi M_{eff}$, and the asymmetry of the $g$-factor inbottom-CoFeB(0.93~nm)/MgO(0.90--1.25~nm)/CoFeB(1.31~nm)-top as-depositedsystems.  Magnetization of CoFeB layers exhibits a specific noncollinear configurationwith orthogonal easy axes and with $4\pi M_{eff}$ values of $+2.2$ kG and$-2.3$ kG for the bottom and top layers, respectively. We show that $4\piM_{eff}$ depends on the asymmetry $g_\perp - g_\parallel$ of the $g$-factormeasured in the perpendicular and the in-plane directions revealing a highlynonlinear relationship. In contrast, the Gilbert damping is practically thesame for both layers. Annealing of the films results in collinear easy axesperpendicular to the plane for both layers. However, the linewidth is stronglyincreased due to enhanced inhomogeneous broadening.

CoFeB/MgO/CoFeB structures with orthogonal easy axes: perpendicular anisotropy and damping